When Memory scan is invoked manually via Clam Sentinel, Clamscan does crash. (see below)
Memory scan does not crash, when Clam Sentinel starts with the Setting selected:
"Scan the memory when the program starts"
Scan Memory with Clam Win does also not crash.

I don't look for a solution. Just want to mention it.
Looked at the differences and noticed, that the Clamscan option "--archive-verbose"
does make the difference - in my case at least. With that option, it does crash.
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Clam Sentinel - Memory scan
Loading virus signature database, please wait... done
*** Scanning Programs in Computer Memory ***
---Please login as an Administrator to scan System processes loaded in computer
memory---
*** Memory Scan: using ToolHelp ***